To learn Ritchie Blackmores Rainbow - Ariel chords, focus on the sequence of these chords: Am, F, Em, C, Em, A, Am, F, E, A, C, B and Cm. I suggest starting at a calm pace of 36 BPM, and as you gain confidence, approach the song's BPM of 72. To match your vocal range and chord inclination, adjust the capo in line with the key: E Minor.